U.S. patent application number 17/285072 was filed with the patent office on 2022-01-27 for magnetic levitation centrifugal pump.
This patent application is currently assigned to EUROSETS S.R.L.. The applicant listed for this patent is EUROSETS S.R.L.. Invention is credited to Edgardo COSTA MAIANTI, Paolo FONTANILI, Nicola GHELLI.
Application Number | 20220025897 17/285072 |
Document ID | / |
Family ID | 1000005953532 |
Filed Date | 2022-01-27 |
United States Patent
Application |
20220025897 |
Kind Code |
A1 |
GHELLI; Nicola ; et
al. |
January 27, 2022 |
MAGNETIC LEVITATION CENTRIFUGAL PUMP
Abstract
A magnetic levitation centrifugal pump, comprises: one hollow
body provided with at least one inlet connector and with at least
one outlet connector for blood; one rotor element, housed inside
the hollow body and comprising at least one magnetic portion, where
the rotor element can be commanded in rotation about an axis of
rotation, without contact, by a stator element associable with the
hollow body, the rotor element comprising at least one revolving
body, which defines an upper surface supporting a plurality of
blades which are adapted to convey blood towards the outlet
connector; where the upper surface has a substantially concave
shape and where the revolving body comprises at least one through
hole which is positioned along the axis of rotation.
Inventors: |
GHELLI; Nicola; (Medolla,
IT) ; FONTANILI; Paolo; (Medolla, IT) ; COSTA
MAIANTI; Edgardo; (Medolla, IT) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
EUROSETS S.R.L. |
Medolla |
|
IT |
|
|
Assignee: |
EUROSETS S.R.L.
Medolla
IT
|
Family ID: |
1000005953532 |
Appl. No.: |
17/285072 |
Filed: |
October 16, 2019 |
PCT Filed: |
October 16, 2019 |
PCT NO: |
PCT/IB2019/058808 |
371 Date: |
April 13, 2021 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
F04D 29/2216 20130101;
A61M 60/205 20210101; A61M 60/82 20210101; F04D 29/048
20130101 |
International
Class: |
F04D 29/048 20060101
F04D029/048; F04D 29/22 20060101 F04D029/22; A61M 60/205 20060101
A61M060/205; A61M 60/82 20060101 A61M060/82 |
Claims
1. A magnetic levitation centrifugal pump comprising: at least one
hollow body provided with at least one inlet connector and with at
least one outlet connector for blood; and at least one rotor
element, housed inside said at least one hollow body and comprising
at least one magnetic portion, where said at least one rotor
element can be commanded in rotation about an axis of rotation,
without contact, by a stator element associable with said at least
one hollow body, said at least one rotor element comprising at
least one revolving body, which defines an upper surface supporting
a plurality of blades which are adapted to convey blood towards
said at least one outlet connector; wherein said upper surface has
a substantially concave shape and said at least one revolving body
comprises at least one through hole which is positioned along said
axis of rotation.
2. The magnetic levitation centrifugal pump according to claim 1,
wherein said upper surface has a curvilinear extension to define a
saddle which is adapted to receive the blood entering said at least
one inlet connector.
3. The magnetic levitation centrifugal pump according to claim 2,
wherein said at least one hole has a first opening facing said
upper surface.
4. The magnetic levitation centrifugal pump according to claim 3,
wherein said upper surface has a joining profile with said first
opening.
5. The magnetic levitation centrifugal pump according to claim 4,
wherein said at least one hollow body has a bottom wall and said at
least one hole has a second opening, opposite said first opening
which faces said bottom wall.
6. The magnetic levitation centrifugal pump according to claim 5,
wherein said plurality of blades have a coupling profile to said
upper surface, having a substantially curvilinear extension.
7. The magnetic levitation centrifugal pump according to claim 6,
wherein said plurality of blades have an upper profile, opposite
said coupling profile, having a substantially rectilinear
extension.
8. The magnetic levitation centrifugal pump according to claim 7,
wherein said plurality of blades have a joining profile of said
coupling profile to said upper profile, where said joining profile
protrudes with respect to the overall dimensions of said at least
one revolving body.
9. The magnetic levitation centrifugal pump acording to claim 8,
wherein said joining profile has a curvilinear extension.
10. The magnetic ie vital ion centrifugal pump according to claim
9, wherein said plurality of blades have a rear profile positioned
between said coupling profile and said upper profile having a
substantially rectilinear extension so as to divide the blood
entering said at least one hollow body. 11. (Currently amended) The
magnetic levitation centrifugal pump according to claim 10, wherein
said rear profile extends substantially parallel to said axis of
rotation.
12. The magnetic levitation centrifugal pump according to claim 11,
wherein said rear profiles of said plurality of blades are
positioned in a radial pattern around said first opening.
13. The magnetic levitation centrifugal pump according to claim 12,
wherein said rear profile is opposite said joining profile.
14. The magnetic levitation centrifugal pump according to claim 3,
wherein said at least one hollow body has a bottom wall, and said
at least one hole has a second opening, opposite said first opening
which faces said bottom wall.
15. The magnetic levitation centrifugal pump according to claim 10,
wherein said rear profiles of said plurality of blades are
positioned in a radial pattern around said first opening.
16. The magnetic levitation centrifugal pump according to claim 10,
wherein said rear profile is opposite said joining profile.
17. The magnetic levitation centrifugal pump according to claim 11,
wherein said rear profile is opposite said joining profile.
18. The magnetic levitation centrifugal pump according to claim 1,
wherein said plurality of blades have a coupling profile to said
upper surface, having a substantially curvilinear extension.
19. The magnetic levitation centrifugal pump according to claim 2,
wherein said plurality of blades have a coupling profile to said
upper surface, having a substantially curvilinear extension.
20. The magnetic levitation centrifugal pump according to claim 3,
wherein said plurality of blades have a coupling profile to said
upper surface, having a substantially curvilinear extension.
Description
TECHNICAL FIELD
[0001] The present invention relates to a magnetic levitation
centrifugal pump.
BACKGROUND ART
[0002] The magnetic levitation centrifugal pumps used in the
biomedical sector are generally composed of an internally hollow
body, provided with at least one blood inlet connector and one
blood outlet connector, inside which is housed a rotor element
provided with a plurality of blades adapted to convey, as a result
of the rotation of the rotor element itself, the incoming blood
towards the outlet connector.
[0003] The rotor element comprises a portion of magnetic material,
and outside the hollow body a stator element is positioned which is
adapted to define at least one magnetic field for lifting and
controlling the rotor element in rotation inside the hollow
body.
[0004] Moreover, the rotor element comprises a revolving body on
which a plurality of blades is arranged in a radial pattern.
[0005] The blades mentioned above are positioned on the upper
portion of the rotor element facing the inlet connector, which has
a truncated-cone shape.
[0006] The inclined surface of the upper portion of the rotor
element is intended to accompany the entry of blood into the hollow
body.
[0007] These centrifugal pumps of known type do have some
drawbacks.
[0008] In particular, the blood entering the hollow body, as a
result of the impact with the upper portion of the rotor element,
is likely to be damaged.
[0009] Another drawback consists in the fact that the impact of
blood with the inclined surface of the rotor element can lead to
the formation of air bubbles, which must then be removed before the
reintroduction of the blood itself into the patient.
[0010] Some types of centrifugal pumps are known from WO 93/20860
A1 and from CN 107693868 A, which, due to their conformation do not
allow to avoid blood stagnation inside the relevant hollow body and
do not allow optimizing the ratio between the head of the pump and
the turbulence inside it.
DESCRIPTION OF THE INVENTION
[0011] The main aim of the present invention is to devise a
magnetic levitation centrifugal pump which allows reducing the
damage of the blood due to its interaction with the rotor
element.
[0012] Within this aim, one object of the present invention is to
reduce the formation of air bubbles inside the pump itself.
[0013] Another object of the present invention is to avoid blood
stagnation inside the relevant hollow body.
[0014] Yet another object is to optimize the ratio between the head
of the pump and the turbulence inside it.
[0015] Another object of the present invention is to devise a
magnetic levitation centrifugal pump which allows overcoming the
aforementioned drawbacks of the prior art in the ambit of a simple,
rational, easy, effective to use and low cost solution.
[0016] The aforementioned objects are achieved by the present
magnetic levitation centrifugal pump having the characteristics of
claim 1.
BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Other characteristics and advantages of the present
invention will be more evident from the description of a preferred,
but not exclusive, embodiment of a magnetic levitation centrifugal
pump, illustrated by way of a non-limiting example in the
accompanying tables of drawing in which:
[0018] FIG. 1 is an axonometric view of a magnetic levitation
centrifugal pump according to the invention;
[0019] FIG. 2 is a cross-sectional view of the pump in FIG. 1;
[0020] FIG. 3 is an exploded view of the pump in FIG. 1;
[0021] FIG. 4 is an axonometric view of the revolving body of the
pump in FIG. 1;
[0022] FIG. 5 is a cross-sectional view of the revolving body in
FIG. 4.
EMBODIMENTS OF THE INVENTION
[0023] With particular reference to these illustrations, reference
numeral 1 globally indicates a magnetic levitation centrifugal
pump.
[0024] The pump 1 comprises at least one hollow body 2 provided
with at least one inlet connector 3 for the venous blood coming
from a patient and with at least one outlet connector 4 for the
venous blood to be conveyed to a blood oxygenation device.
[0025] The hollow body 2 therefore defines a volume 7, on which the
inlet connector 3 and the outlet connector 4 face, inside which is
housed at least one rotor element 8, comprising at least one
magnetic portion 9.
[0026] The rotor element 8 can be commanded in rotation about an
axis of rotation X, without contact, by a stator element (not shown
in the illustrations), associable with the hollow body 2. More in
detail, the rotor element 8 is commanded in rotation directly from
the stator, i.e. without the interposition of additional
intermediate elements.
[0027] The way in which the rotation of the rotor element 8 is
controlled, although not related to in the present invention, is
widely known to the technician in the field.
[0028] In particular, the stator element comprises a plurality of
windings intended to be crossed by the electric current for the
formation of one or more magnetic fields which are adapted to
interact with the rotor element 8 to raise and bring it in rotation
around the axis of rotation X.
[0029] More specifically, the rotor element 8 comprises at least
one revolving body 10, which defines an upper surface 12 supporting
a plurality of blades 11 which are adapted to convey the blood
entering the volume 7 towards the outlet connector 4.
[0030] The blades 11 are appropriately arranged on the upper
surface 12 in a radial pattern.
[0031] According to the invention, the upper surface 12 has a
substantially concave shape and the revolving body 10 has a through
hole 30 which is positioned along the axis of rotation X.
[0032] In particular, the venous blood entering the volume 7
through the inlet connector 3 meets the blades 11 and, while one
part passes through the hole 30, the other part contacts the upper
surface 12 and, due to the rotation of the blades 11, is conveyed
towards the outlet connector 4.
[0033] Advantageously, the upper surface 12 has a curvilinear
extension to define a saddle 13 adapted to receive the blood
entering the inlet connector 3.
[0034] One part of the blood entering the volume 7 internally
therefore contacts the upper surface 12, the curvilinear shape of
which accompanies the descent thereof, preventing it from being
thrown out of the rotor element 8 as a result of the impact, thus
reducing the risk of damage to the blood itself.
[0035] The hole 30 thus allows the recirculation of the part of the
blood entering the volume 7, thus avoiding blood stagnation
phenomena.
[0036] More particularly, the hole 30 has a first opening 30a
facing the upper surface 12.
[0037] Appropriately, the upper surface 12 has a joining profile 31
with the first opening 30a.
[0038] The hole 30 then has a second opening 30b, opposite the
first opening 30a, which faces a bottom wall 20a of the hollow body
2.
[0039] Conveniently, the blades 11 have a coupling profile 14 for
coupling to the upper surface 12, which profile also has a
substantially curvilinear extension, so as to join with the upper
surface itself and facilitate the flow of blood.
[0040] Preferably, the blades 11 have an upper profile 15, opposite
the coupling profile 14, having a substantially rectilinear
extension (i.e. except for the machining tolerances).
[0041] Advantageously, the blades 11 have a joining profile 17 of
the coupling profile 14 with the upper profile 15, where the
joining profile 17 protrudes from the overall dimensions of the
revolving body 10. The term "overall dimensions" of the revolving
body 10 means the extension of the revolving body 10 transverse to
the axis of rotation X.
[0042] The joining profile 17 protrudes from the overall dimensions
of the revolving body 10 in order to define a large surface area of
impact with the blood. In the preferred embodiment shown in the
figures, the joining profile 17 has a curvilinear extension.
[0043] The blades 11 do also have a rear profile 32, positioned
between the coupling profile 14 and the upper profile 15 having a
substantially rectilinear extension (i.e. except for the machining
tolerances and the ends connected to the adjacent profiles).
[0044] Advantageously, the rear profile 32 extends parallel to the
axis of rotation X.
[0045] The shape of the rear profile 32 allows dividing the flow of
blood entering the volume 7 into two parts, one of which is
conveyed into the hole 30 and the other is conveyed along the upper
wall 12.
[0046] The rear profile 32 is located on the opposite side of the
joining profile 17 of the relevant blade 11.
[0047] The rear profiles 32 of the blades 11 are then positioned in
a radial pattern around the first opening 30a of the hole 30.
[0048] The revolving body 10 is provided with a housing seat 18,
defined at the bottom portion, inside which is inserted the
magnetic portion 9, which is closed below by a retaining element
19.
[0049] The magnetic portion 9 is arranged around the hole 30.
[0050] The hollow body 2 comprises at least one lower element 5 and
at least one upper element 6 separated from each other and mutually
coupled.
[0051] Additionally, the lower element 5 has a containment seat 20
adapted to accommodate at least one portion of the revolving body
10, which defines the bottom wall 20a. The bottom wall 20a is
provided with a guiding member 20b, defined at the axis of rotation
X, for the centering of the rotor element 8.
[0052] Advantageously, the upper element 6 has at least one
perimeter flange 21 for coupling to the lower element 5 and at
least one substantially dome-shaped body 22, which protrudes from
the perimeter flange 21, where the outlet connector 4 is associated
with the dome-shaped body 22.
[0053] Preferably, the perimeter flange 21 defines a coupling
surface 21a with the lower element 5 and the outlet connector 4 is
raised with respect to the coupling surface 21a.
[0054] In the embodiment shown in the illustrations, the coupling
surface 21a is substantially flat.
[0055] Between the outlet connector 4 and the perimeter flange 21,
an air space 29 is defined inside which the tightening means can be
inserted to tighten the upper element 6 and the lower element 5
during the welding operations.
[0056] Appropriately, sealing means 26 are positioned between the
coupling surface 21a and the lower element 5.
[0057] Advantageously, the inlet connector 3 and the outlet
connector 4 are substantially elongated in shape.
[0058] In the particular embodiment shown in the illustrations, the
inlet connector 3 is positioned at the top of the upper element 6
and extends coaxially to the axis of rotation X.
[0059] Conveniently, the upper element 6 and the lower element 5
are provided with relevant centering means 23 adapted to ensure
their correct mutual positioning.
[0060] More in detail, the centering means 23 comprise at least one
relief 24 defined on one of either the coupling surface 21a or the
lower element 5 and at least one recess 25 defined on the other of
either the lower element 5 or the coupling surface 21a, where the
relief 24 is adapted to be inserted in the recess 25 following the
positioning of the upper element 6 on the lower element 5.
[0061] In the particular embodiment shown in the illustrations, the
upper element 6 and the lower element 5 have a substantially
circular section, therefore the recess 25 and the relief 24 have a
substantially annular extension.
[0062] The attached figures also show, although not part of the
present invention, the covering element 27 of the stator element
mentioned above, which is intended to support the hollow body 2,
and the anchoring element 28 of the hollow body 2 to the covering
element 27.
[0063] It has in practice been found that the described invention
achieves the intended objects and, in particular, the fact is
underlined that the substantially concave shape of the upper
surface allows reducing the risk of damage that the blood may
suffer as a result of the impact with the revolving body.
[0064] In addition, the presence of the saddle means that the
trajectory run by the blood is linear, thus reducing the formation
of air bubbles inside it compared to the pumps of known type.
* * * * *